#!/bin/bash
#==============================================================================
# Copyright 2014 zod.yslin
# Author: zod.yslin
# Email:
# File Name: tcpdump.sh
# Description:
#   One of the most useful tools at our disposal for debugging network
#   applications or troubleshooting network problems is a sniffer or network
#   analyzer.
#
#   tcpdump has two components: 
#   1. a kernel component to capture and possibly filter packets from the
#      network 
#   2. a user space component to handle user interface, formatting, and
#      filtering if it’s not done in the kernel.
#      use libpcap (the packet capture library) to communicate with the kernel
#      component.
#
#   only look at icmp, try effective 44 tips, icmp
# Edit History:
#   2014-12-28    File created.
#==============================================================================

